You mean the manifolds or the decats?
All depends on your emissions the headers do say "for race use only" but that is because they are American, on a car that age you can remove CAT's as long as the car will pass emissions - or so I believe, check with an MOT centre - of course I used Hi Flow CATs for the road and only put on the the De-CATs for track
Yes the headers are very close to the starter motor - always have been - never had an issue with it, never had to replace a starter motor since the rebuild, they are ceramic coated which should help keep the heat inside - if you want to go another step you could wrap them and if you are really keen you could fit a small plate between the starter and the header to reflect heat - as I say never caused me an issue though